Infantile nystagmus syndrome with latent nystagmus

This patient developed infantile nystagmus in early infancy due to retinopathy of prematurity. In addition to a continuous torsional pendular nystagmus, latent nystagmus was apparent with either eye covered (e.g., right-beating with right eye viewing and left-beating with left eye viewing) and was associated with esotropia. Mixed pendular and jerk waveforms are common in infantile nystagmus, oscillopsia was absent, and all classes of eye movements (e.g., saccades, pursuit, vestibulo-ocular reflex, etc) were normal. While infantile nystagmus is usually predominantly horizontal, torsional and/or vertical vectors can be seen depending on the etiology and other factors. This patient's nystagmus was well documented and unchanged over several decades.